My character isn't dealing damage to monsters

My character is a Knight, but during battles like the Time Rift, my character goes through the attack motions, but a green barrier keeps appearing and it often doesn’t deal any damage to the monsters. Is there a way to prevent the green barrier from appearing? They keep using the barrier over and over again—if they had just attacked in that time, they would have defeated the monster already. This is so frustrating! :angry_face_with_horns: There is way too little information on combat, skills, and stats..